Firefox on your phone (or tablet) at Mobile World Congress

Mozilla's Firefox OS is back with a vengeance at Mobile World Congress, as several manufacturers showed a wide variety of handsets and even one tablet. Let CNET take you on a guided tour.

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Mozilla's cost-conscious prototype Firefox phone

A year after the Firefox smartphone OS made its debut, Mozilla and its partners returned to Mobile World Congress with a whole new set of Firefox phones. And this time, we even got a Firefox tablet. Most of the devices came from handset makers like Alcatel and ZTE, but Mozilla also showed its own prototype of a Firefox OS phone expected to go on sale later this year for $25.

Alcatel One Touch Fire E

Slim, trim, and compact, the One Touch Fire E flaunts a big 4.5-inch screen plus dual-core processing, 512MB of RAM, and 4GB of internal storage. That makes it a bit underpowered compared with many Android phones.

Alcatel One Touch Fire 7

The One Touch Fire 7 is the first Firefox OS-based tablet. Its specs include a 7-inch qHD (960x540-pixel) display, a dual-core 1.2GHz processor, VGA front and rear cameras, 4GB on internal storage (up to 32GB with a microSD card), and 2GB of RAM.

ZTE Grand Memo II

The ZTE Grand Memo II LTE has a matte plastic textured design and a massive 6-inch HD display (a bump from its 5.7-inch predecessor). It's powered by a Snapdragon 400 processor (last year's model used either a Snapdragon 600 or 800 chip depending on the variant), it runs Android 4.4 KitKat, and it has a 13-megapixel camera.

Alcatel One Touch Fire S

The One Touch Fire S shares the same metallic finish as the Idol 2 Mini S, which gives it a premium feel. Features include a quad-core 1.2GHz processor, LTE connectivity, NFC and an 8-megapixel camera.

ZTE Open II

The sequel to the ZTE Open, the Open II runs on 3G and and a 1.2GHz dual-core processor. It ships with the latest Firefox OS 1.3, a 3.5-inch HVGA display with a 480x320-pixel resolution, and a 2-megapixel camera.